Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.25% |
| 2 | Technology | 0.44% |
| 3 | Consumer Discretionary | 0.32% |
| 4 | Healthcare | 0.22% |
| 5 | Financials | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$815B
| $19B | 14.91% |
44,433,200
+11,116,100
| +33% | +$4.94B |
2015 Q1
34 quarters
|
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$815B
| $9.06B | 7.12% |
21,223,800
+2,015,000
| +10% | +$896M |
2015 Q1
34 quarters
|
|
3
PUT
Invesco QQQ Trust
QQQ
$475B
| $6.82B | 5.36% |
19,040,000
+3,072,200
| +19% | +$1.14B |
2021 Q2
9 quarters
|
|
4
PUT
iShares S&P 100 ETF
OEF
$20.3B
| $4.02B | 3.16% |
32,508,600
+2,178,900
| +7% | +$454M |
2014 Q4
35 quarters
|
|
5
PUT
Tesla
TSLA
$1.48T
| $3.25B | 2.56% |
13,177,100
-272,000
| -2% | -$69.9M |
2021 Q2
9 quarters
|
|
|
6
CALL
Invesco QQQ Trust
QQQ
$475B
| $3.21B | 2.53% |
8,965,100
+431,300
| +5% | +$160M |
2021 Q2
9 quarters
|
|
|
7
CALL
Tesla
TSLA
$1.48T
| $2.9B | 2.28% |
11,590,300
-2,116,600
| -15% | -$544M |
2021 Q2
9 quarters
|
|
|
8
CALL
iShares S&P 100 ETF
OEF
$20.3B
| $2.83B | 2.22% |
24,887,500
+2,228,800
| +10% | +$464M |
2014 Q4
35 quarters
|
|
|
9
CALL
Apple
AAPL
$5.08T
| $2.52B | 1.98% |
14,699,300
+621,000
| +4% | +$114M |
2015 Q1
34 quarters
|
|
|
10
CALL
NVIDIA
NVDA
$5.13T
| $2.39B | 1.88% |
55,006,000
-1,919,000
| -3% | -$86M |
2021 Q2
9 quarters
|
|
|
11
PUT
NVIDIA
NVDA
$5.13T
| $2.24B | 1.76% |
51,582,000
-9,214,000
| -15% | -$413M |
2021 Q2
9 quarters
|
|
|
12
PUT
Apple
AAPL
$5.08T
| $1.65B | 1.3% |
9,652,100
-642,300
| -6% | -$118M |
2015 Q1
34 quarters
|
|
13
CALL
Meta Platforms (Facebook)
META
$1.65T
| $1.61B | 1.27% |
5,364,900
+306,300
| +6% | +$92.3M |
2014 Q4
35 quarters
|
|
14
CALL
Microsoft
MSFT
$3.87T
| $1.47B | 1.16% |
4,837,900
+876,200
| +22% | +$290M |
2014 Q4
35 quarters
|
|
15
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.18B
| $1.35B | 1.06% |
38,803,600
+8,183,800
| +27% | +$336M |
2015 Q1
34 quarters
|
|
16
CALL
Alphabet (Google) Class A
GOOGL
$3.96T
| $1.27B | 1% |
9,656,400
-3,081,700
| -24% | -$399M |
2015 Q4
31 quarters
|
|
|
17
PUT
Microsoft
MSFT
$3.87T
| $1.24B | 0.97% |
3,923,500
+74,400
| +2% | +$24.6M |
2014 Q4
35 quarters
|
|
|
18
CALL
Amazon
AMZN
$2.7T
| $1.21B | 0.95% |
9,484,900
-1,751,600
| -16% | -$235M |
2015 Q1
34 quarters
|
|
|
19
PUT
Meta Platforms (Facebook)
META
$1.65T
| $1.09B | 0.86% |
3,631,800
+11,000
| +0.3% | +$3.31M |
2014 Q4
35 quarters
|
|
|
20
CALL
SPDR Gold Trust
GLD
$136B
| $1.01B | 0.8% |
5,915,700
+1,395,900
| +31% | +$250M |
2015 Q1
34 quarters
|
|
|
21
PUT
Amazon
AMZN
$2.7T
| $976M | 0.77% |
8,026,100
+726,300
| +10% | +$97.3M |
2015 Q1
34 quarters
|
|
|
22
PUT
Alphabet (Google) Class A
GOOGL
$3.96T
| $931M | 0.73% |
7,410,900
-1,831,100
| -20% | -$237M |
2015 Q4
31 quarters
|
|
|
23
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.18B
| $904M | 0.71% |
25,022,200
+5,612,600
| +29% | +$231M |
2015 Q1
34 quarters
|
|
|
24
PUT
Netflix
NFLX
$279B
| $633M | 0.5% |
16,757,000
-208,000
| -1% | -$8.82M |
2014 Q4
35 quarters
|
|
25
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.7B
| $605M | 0.48% |
1,806,800
+785,400
| +77% | +$272M |
2015 Q1
34 quarters
|
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading's Q3 2023 filing shows 1,401 new, 3,687 increased, 3,362 reduced and 1,720 closed positions. Its largest new stake was Amazon: 841,102 shares worth $107M. The largest sale was Netflix, an estimated $27.1M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,401 new positions and closed 1,720 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.